mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 03:26:40 +07:00
89360b87c3
Now that we're reusing the badrange functions for nfit_test, and that exposes badrange injection/clearing to userspace via the DSM paths, it is plausible that a user may call the clear DSM multiple times. Since it is harmless to do so, we can remove the WARN in badrange_forget. Cc: Dave Jiang <dave.jiang@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
294 lines
8.1 KiB
C
294 lines
8.1 KiB
C
/*
|
|
* Copyright(c) 2017 Intel Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
#include <linux/libnvdimm.h>
|
|
#include <linux/badblocks.h>
|
|
#include <linux/export.h>
|
|
#include <linux/module.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/device.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/ndctl.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/io.h>
|
|
#include "nd-core.h"
|
|
#include "nd.h"
|
|
|
|
void badrange_init(struct badrange *badrange)
|
|
{
|
|
INIT_LIST_HEAD(&badrange->list);
|
|
spin_lock_init(&badrange->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(badrange_init);
|
|
|
|
static void append_badrange_entry(struct badrange *badrange,
|
|
struct badrange_entry *bre, u64 addr, u64 length)
|
|
{
|
|
lockdep_assert_held(&badrange->lock);
|
|
bre->start = addr;
|
|
bre->length = length;
|
|
list_add_tail(&bre->list, &badrange->list);
|
|
}
|
|
|
|
static int alloc_and_append_badrange_entry(struct badrange *badrange,
|
|
u64 addr, u64 length, gfp_t flags)
|
|
{
|
|
struct badrange_entry *bre;
|
|
|
|
bre = kzalloc(sizeof(*bre), flags);
|
|
if (!bre)
|
|
return -ENOMEM;
|
|
|
|
append_badrange_entry(badrange, bre, addr, length);
|
|
return 0;
|
|
}
|
|
|
|
static int add_badrange(struct badrange *badrange, u64 addr, u64 length)
|
|
{
|
|
struct badrange_entry *bre, *bre_new;
|
|
|
|
spin_unlock(&badrange->lock);
|
|
bre_new = kzalloc(sizeof(*bre_new), GFP_KERNEL);
|
|
spin_lock(&badrange->lock);
|
|
|
|
if (list_empty(&badrange->list)) {
|
|
if (!bre_new)
|
|
return -ENOMEM;
|
|
append_badrange_entry(badrange, bre_new, addr, length);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* There is a chance this is a duplicate, check for those first.
|
|
* This will be the common case as ARS_STATUS returns all known
|
|
* errors in the SPA space, and we can't query it per region
|
|
*/
|
|
list_for_each_entry(bre, &badrange->list, list)
|
|
if (bre->start == addr) {
|
|
/* If length has changed, update this list entry */
|
|
if (bre->length != length)
|
|
bre->length = length;
|
|
kfree(bre_new);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If not a duplicate or a simple length update, add the entry as is,
|
|
* as any overlapping ranges will get resolved when the list is consumed
|
|
* and converted to badblocks
|
|
*/
|
|
if (!bre_new)
|
|
return -ENOMEM;
|
|
append_badrange_entry(badrange, bre_new, addr, length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int badrange_add(struct badrange *badrange, u64 addr, u64 length)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock(&badrange->lock);
|
|
rc = add_badrange(badrange, addr, length);
|
|
spin_unlock(&badrange->lock);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(badrange_add);
|
|
|
|
void badrange_forget(struct badrange *badrange, phys_addr_t start,
|
|
unsigned int len)
|
|
{
|
|
struct list_head *badrange_list = &badrange->list;
|
|
u64 clr_end = start + len - 1;
|
|
struct badrange_entry *bre, *next;
|
|
|
|
spin_lock(&badrange->lock);
|
|
|
|
/*
|
|
* [start, clr_end] is the badrange interval being cleared.
|
|
* [bre->start, bre_end] is the badrange_list entry we're comparing
|
|
* the above interval against. The badrange list entry may need
|
|
* to be modified (update either start or length), deleted, or
|
|
* split into two based on the overlap characteristics
|
|
*/
|
|
|
|
list_for_each_entry_safe(bre, next, badrange_list, list) {
|
|
u64 bre_end = bre->start + bre->length - 1;
|
|
|
|
/* Skip intervals with no intersection */
|
|
if (bre_end < start)
|
|
continue;
|
|
if (bre->start > clr_end)
|
|
continue;
|
|
/* Delete completely overlapped badrange entries */
|
|
if ((bre->start >= start) && (bre_end <= clr_end)) {
|
|
list_del(&bre->list);
|
|
kfree(bre);
|
|
continue;
|
|
}
|
|
/* Adjust start point of partially cleared entries */
|
|
if ((start <= bre->start) && (clr_end > bre->start)) {
|
|
bre->length -= clr_end - bre->start + 1;
|
|
bre->start = clr_end + 1;
|
|
continue;
|
|
}
|
|
/* Adjust bre->length for partial clearing at the tail end */
|
|
if ((bre->start < start) && (bre_end <= clr_end)) {
|
|
/* bre->start remains the same */
|
|
bre->length = start - bre->start;
|
|
continue;
|
|
}
|
|
/*
|
|
* If clearing in the middle of an entry, we split it into
|
|
* two by modifying the current entry to represent one half of
|
|
* the split, and adding a new entry for the second half.
|
|
*/
|
|
if ((bre->start < start) && (bre_end > clr_end)) {
|
|
u64 new_start = clr_end + 1;
|
|
u64 new_len = bre_end - new_start + 1;
|
|
|
|
/* Add new entry covering the right half */
|
|
alloc_and_append_badrange_entry(badrange, new_start,
|
|
new_len, GFP_NOWAIT);
|
|
/* Adjust this entry to cover the left half */
|
|
bre->length = start - bre->start;
|
|
continue;
|
|
}
|
|
}
|
|
spin_unlock(&badrange->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(badrange_forget);
|
|
|
|
static void set_badblock(struct badblocks *bb, sector_t s, int num)
|
|
{
|
|
dev_dbg(bb->dev, "Found a bad range (0x%llx, 0x%llx)\n",
|
|
(u64) s * 512, (u64) num * 512);
|
|
/* this isn't an error as the hardware will still throw an exception */
|
|
if (badblocks_set(bb, s, num, 1))
|
|
dev_info_once(bb->dev, "%s: failed for sector %llx\n",
|
|
__func__, (u64) s);
|
|
}
|
|
|
|
/**
|
|
* __add_badblock_range() - Convert a physical address range to bad sectors
|
|
* @bb: badblocks instance to populate
|
|
* @ns_offset: namespace offset where the error range begins (in bytes)
|
|
* @len: number of bytes of badrange to be added
|
|
*
|
|
* This assumes that the range provided with (ns_offset, len) is within
|
|
* the bounds of physical addresses for this namespace, i.e. lies in the
|
|
* interval [ns_start, ns_start + ns_size)
|
|
*/
|
|
static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len)
|
|
{
|
|
const unsigned int sector_size = 512;
|
|
sector_t start_sector, end_sector;
|
|
u64 num_sectors;
|
|
u32 rem;
|
|
|
|
start_sector = div_u64(ns_offset, sector_size);
|
|
end_sector = div_u64_rem(ns_offset + len, sector_size, &rem);
|
|
if (rem)
|
|
end_sector++;
|
|
num_sectors = end_sector - start_sector;
|
|
|
|
if (unlikely(num_sectors > (u64)INT_MAX)) {
|
|
u64 remaining = num_sectors;
|
|
sector_t s = start_sector;
|
|
|
|
while (remaining) {
|
|
int done = min_t(u64, remaining, INT_MAX);
|
|
|
|
set_badblock(bb, s, done);
|
|
remaining -= done;
|
|
s += done;
|
|
}
|
|
} else
|
|
set_badblock(bb, start_sector, num_sectors);
|
|
}
|
|
|
|
static void badblocks_populate(struct badrange *badrange,
|
|
struct badblocks *bb, const struct resource *res)
|
|
{
|
|
struct badrange_entry *bre;
|
|
|
|
if (list_empty(&badrange->list))
|
|
return;
|
|
|
|
list_for_each_entry(bre, &badrange->list, list) {
|
|
u64 bre_end = bre->start + bre->length - 1;
|
|
|
|
/* Discard intervals with no intersection */
|
|
if (bre_end < res->start)
|
|
continue;
|
|
if (bre->start > res->end)
|
|
continue;
|
|
/* Deal with any overlap after start of the namespace */
|
|
if (bre->start >= res->start) {
|
|
u64 start = bre->start;
|
|
u64 len;
|
|
|
|
if (bre_end <= res->end)
|
|
len = bre->length;
|
|
else
|
|
len = res->start + resource_size(res)
|
|
- bre->start;
|
|
__add_badblock_range(bb, start - res->start, len);
|
|
continue;
|
|
}
|
|
/*
|
|
* Deal with overlap for badrange starting before
|
|
* the namespace.
|
|
*/
|
|
if (bre->start < res->start) {
|
|
u64 len;
|
|
|
|
if (bre_end < res->end)
|
|
len = bre->start + bre->length - res->start;
|
|
else
|
|
len = resource_size(res);
|
|
__add_badblock_range(bb, 0, len);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nvdimm_badblocks_populate() - Convert a list of badranges to badblocks
|
|
* @region: parent region of the range to interrogate
|
|
* @bb: badblocks instance to populate
|
|
* @res: resource range to consider
|
|
*
|
|
* The badrange list generated during bus initialization may contain
|
|
* multiple, possibly overlapping physical address ranges. Compare each
|
|
* of these ranges to the resource range currently being initialized,
|
|
* and add badblocks entries for all matching sub-ranges
|
|
*/
|
|
void nvdimm_badblocks_populate(struct nd_region *nd_region,
|
|
struct badblocks *bb, const struct resource *res)
|
|
{
|
|
struct nvdimm_bus *nvdimm_bus;
|
|
|
|
if (!is_memory(&nd_region->dev)) {
|
|
dev_WARN_ONCE(&nd_region->dev, 1,
|
|
"%s only valid for pmem regions\n", __func__);
|
|
return;
|
|
}
|
|
nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
|
|
|
|
nvdimm_bus_lock(&nvdimm_bus->dev);
|
|
badblocks_populate(&nvdimm_bus->badrange, bb, res);
|
|
nvdimm_bus_unlock(&nvdimm_bus->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_badblocks_populate);
|